Constitutive modelling of creep degradation due to rafting in single-crystalline Ni-base superalloys
- A constitutive model for the mechanical behaviour of single-crystalline superalloys at high temperatures has been developed. The model relies on the slip system theory and is able to predict rafting and its influence on plastic flow. The kinetics of rafting are assumed to be driven by the reduction of the internal stresses represented by the macroscopic back-stress. The rafting effect is incorporated in the model through the dependence of the Orowan stress on the channel width. The model has been validated for the alloy CMSX-4 at 950 °C. The rafting part of the model has been calibrated by measurements of the channel widths after several levels of creep strains and for several loads.
Autor*innen: | Bernard FedelichORCiD, Georgia Künecke, A. Epishin, T. Link, Pedro Dolabella PortellaORCiD |
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Dokumenttyp: | Zeitschriftenartikel |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Materials science and engineering A |
Jahr der Erstveröffentlichung: | 2009 |
Verlag: | Elsevier |
Verlagsort: | Amsterdam |
Jahrgang/Band: | 510-511 |
Erste Seite: | 273 |
Letzte Seite: | 277 |
Freie Schlagwörter: | Constitutive modelling; Creep; Rafting; Single crystal superalloy; Viscoplasticity |
DOI: | 10.1016/j.msea.2008.04.089 |
ISSN: | 0921-5093 |
ISSN: | 1873-4936 |
Verfügbarkeit des Dokuments: | Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access") |
Bibliotheksstandort: | Sonderstandort: Publica-Schrank |
Datum der Freischaltung: | 19.02.2016 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 13.05.2009 |